dapsone (dr samiullah khalil )
DESCRIPTION
dr samiullah khalil peshawar pakistanTRANSCRIPT
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DAPSONEDr samiullah khalil
Fcps (II) Trainee
Dermatology
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INTRODUCTION In the early 20th century, it is invented by the
German chemist Paul Ehrlich while working on selective toxicity .
Dapsone (diamino-diphenyl sulfone) is a medication most commonly used in combination with rifampicin and clofazimine as multidrug therapy (MDT) for the treatment of Mycobacterium leprae infections (leprosy). Official in IP,BP,USP.
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STRUCTURE4,4’-diaminodiphenylsulfone
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MECHANISM OF ACTION
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1. Absorption It is completely absorbed after oral
administration
PHARMACOKINETICS
2. Distribution Approximately 70% bound to plasma
protein. The main metabolite, monoacetyl dapsone, is nearly 100% protein bound.
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After oral administration the drug is mainly eliminated by kidney.20 percent is excreted unchanged while 80 percent as derivatives.
Only minor amount is excreted in faeces .
Bile: 10% of an oral dose was found in the bile
Breast-milk: Dapsone is excreted in breast milk
Elimination
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Plasma concentration of Dapsone is reduced by Rafampicin.
Plasma concentration of both drugs may increase when Dapsone given with Trimethoprim.
This medication may decrease the effectiveness of combination-type birth control pills.
This can result in pregnancy.
DRUG INTERACTIONS:
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Mycobacterium leprae infections (leprosy)./hansen’s disease
Linear Ig A Bullous disease Acne. Vasculitis Sweet syndrome Mycetoma
USES
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Pyoderma GangrenosumApthous ulcerationGranuloma AnnularePneumocystis pneumonia.Dermatitis Herpetiformis.Toxoplasmosis - Prophylaxis
USES
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DOSE DISEASE ADULT CHILDREN DAYS
Leprosy - Lepromatous
50-100 mg/day
6-10 mg/day 2-5 years
Leprosy - Tuberculoid
100 mg/day
NA 6 months
Dermatitis Herpetiformis
50-300 mg/day
NA Life long basis
Pneumocystis Pneumonia
100 mg/day
2 mg/kg/day 14-21 days
Pneumocystis Pneumonia Prophylaxis
100 mg/day
2 mg/kg/day Life long basis
Toxoplasmosis - Prophylaxis
100 mg/day
2 mg/kg/day Life long basis
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Administered transdermally As a gel 5% topical acne medication available in 3-, 30-, and 60-gram tubes. In normal use, 0.5 grams should be
administered to the face per application twice a day.
TRANSDERMAL DOSE
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Mild haemolytic anaemia (decreases with use of Vit C or Vit E ).Gastric intolerance-nausea & anorexiaMethaemoglobinaemia (treated with Cemitidine)
, headache, paresthesias, mental symptoms & drug fever
allergic rashes, fixed drug eruption, hypermelanosis, phototoxicity& rarely exfoliative dermatitis, steven Jhonsen syndrome.
Hepatitis & agranulocytosis
ADVERSE ACTION
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Uncommonly weakness of the feet and hands muscles with dose greater then 100 mg/day It is tested by ability to walk on toes tip and to
test Hand grip.Leucopenia presents with fever ,sore throat ,skin
infections and other common infections.Bluish discoloration of lips and finger tips Dapsone reaction/sulfone syndrome
ADVERSE ACTION
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Hypersensitivity more frequent in patients receiving
multiple-drug therapy.The reaction involves a rash and may
also include fever, jaundice, and eosinophilia.
Swollen lymph glands and internal organ failure (Liver , Lungs , Heart and Kidney).
In general, these symptoms will occur within the first six weeks of therapy or not at all, and may be treated by corticosteroid therapy.
Dapsone reaction
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Allergic to sulphur containing antibiotics
G6PD deficiency Heart diseases Lung diseases Breast feeding Pregnancy Porphyria
Contraindications
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FBC before the start of the therapy
Then at 1 weekThen once monthly
Monitoring
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